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Table 3 The correlation between self-reported time (IPAQ-SF) spent on three different physical activity intensities with measures from SWA, for total-, inactive- and active group, using Spearman correlation coefficient (SCC) (n = 64)

From: Reliability and concurrent validity of the International Physical Activity Questionnaire short form among pregnant women

Intensity IPAQ-SF SWA  
Total group Median (Q1,Q3)/ ln mean (SD) min/week Median (Q1,Q3)/ ln mean (SD) min/week τ (p)
MPA 40 (0,120)/2.8 (2.3) 139 (47,223)/4.5 (1.5) 0.08 (p = 0.536)
VPA 28 (42) /1.5 (2.1) 2 (9) /0.2 (0.9) 0.39 ( p= 0.002)
MVPA 80 (0,148)/3.2 (2.4) 168 (51,293)/4.7 (1.5) 0.14 (p = 0.280)
Inactive group (MVPA measured with SWA < 150 min/week) n = 30
MPA 50 (0,125)/2.8 (2.4) 44 (14,96)/3.4 (1.5) 0.38 (p= 0.037)
VPA 16 (33) /1.0 (1.8) 0/0.0 -
MVPA 70 (0,125)/3.0 (2.5) 47 (14,120)/3.6 (1.5) 0.25 (p = 0.186)
Active group (MVPA measured with SWA ≥150 min/week) n = 34
MPA 40 (0,120)/2.9 (2.2) 210(175,319)/5.5 (0.4) −0.02 (p = 0.905)
VPA 39 (47) /2.1 (2.2) 4 (12) /0.4 (1.1) 0.42 (p= 0.013) a
MVPA 115 (0,180)/3.4 (2.3) 290(193,362)/5.7 (1.1) −0.06 (p = 0.726)
  1. Presented as mean min/week (SD) and not as median, due to median and IQR value zero for the skewed data
  2. IPAQ-SF: International Physical Activity Questionnaire short form
  3. SWA: SenseWear Armband
  4. Q1: First quartile, 25% of scores has value lower than Q1
  5. Q3: Third quartile, 75% of scores has value lower than Q3
  6. ln: natural logarithm
  7. SD: standard deviation
  8. τ = Spearman correlation coefficient, SCC
  9. p = level of significance
  10. MPA: moderate physical activity
  11. VPA: vigorous physical activity
  12. MVPA: moderate to vigorous physical activity